If your feed takes too long to upload:

• Check that your feed is in the right format and isn't too large. You can use the CSV, TSV and XML (ATOM/RSS) for your feed file. If you manually upload a feed, you should upload fewer than 5 million products per feed. If you schedule your upload, you should limit your feed to 100 MB unless you're uploading via HTTP/FTP (in which case, the limit is 8 GB).
• Check that there are no network connectivity issues. If you're unable to connect to your network, or you're experiencing intermittent connectivity issues, you may want to contact your Internet service provider or network administrator.
• Consider using a compressed feed file. You can compress your feed file using the ZIP, GZIP and BZ2 compression formats.

* Nguồn: Facebook